How do you create a swap space in Linux?

Creating swap space in Linux is essential for managing memory effectively, especially when physical RAM is fully utilized. The process involves several distinct steps, and option B outlines the complete and correct procedure for creating a swap file in Linux.

This approach begins with fallocate -l 1G /swapfile, which allocates a file of size 1 gigabyte for use as swap space. The use of fallocate is efficient because it reserves the needed space on the filesystem without writing zeroes to each block, making it a quicker option than alternatives.

Next, the command chmod 600 /swapfile sets the appropriate permissions for the swap file, ensuring that only the root user has read and write access. This is a crucial security step, as swap files can contain sensitive data from memory.

The command mkswap /swapfile prepares the file to be used as swap space. This step initializes the swap area, marking it in a way that the kernel can recognize and utilize it effectively.

Finally, swapon /swapfile enables the swap space, allowing the system to start using the file as virtual memory. Each of these steps is critical for the successful setup and effective operation of the swap file.

Other options may